1998 Fiscal Year Final Research Report Summary
PREPARATION OF UNIQUE COLORED GLASSES LIKE A BLUEBROWN DICHROIC GLASS BY COLLOIDAL GOLD AND THE OPTICAL
| Project/Area Number |
09555280
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
無機工業化学
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| Research Institution | MIYAKONOJO NATIONAL COLLEGE OF TECHNOLOGY |
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Principal Investigator |
KOKUBU Toshinori MIYAKONOJO NATIONAL COLLEGE OF TECHNOLOGY,, PROFESSOR, 教授 (70044568)
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| Project Period (FY) |
1997 – 1998
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| Keywords | dichroic glass / blue-brown dichroism / color by colloidal gold / opal glass and red light transmit / calculation by Mie theory / problems in mass melting / effect of reducing agents / scattring and absorption |
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| Research Abstract |
Blue-brown dichroic glass by colloidal gold which displays deep blue transmitted color and brown surface color was prepared in the glass system of 52.5 Si0_2-13.3 A1_20_3-17.4 B_20_3-10.2 CaO-2.0 MgO-4.6 Li_2O (mol%) adding 0.022 wt% of gold without reducing agents. The blue-brown dichroic glass contained octahedral crystals of gold size of about 50-60 nm in radius. The dichroic glass exhibited a lower extinction in blue light region and a stronger scattering in red light region of visible light, than those in the calculated spectra by Mie theory. The calculated true absorption spectra had no peak as the size of particles became larger beyond 45 rim in radius. It was concluded, therefore, that the blue-brown dichroism was originating from scattering itself by gold particles, shaped in octahedron and aggregated into cluster. A white opaline glass which transmits the red light in visible light region could be prepared from the composition of 55.0 SiO_2-7.0 A1_20_3-17.5 B_20_3-10.5 CaCO_3-2.0 MgO-0.7 BaCO_3-0.5 NaBF_4-4.2 Na_2CO_3-2.6 K_2C0_3 (mol%) adding 0.002 wt% of gold and 0.2 wt% of Sn. In this glass, the wavelength below 550 nm in visible light region was strongly scattered out and red light was passing through.
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Research Products
(2 results)
